Clicking on a back link to do the same thing as clicking the browser back button

[securobo2]

I have a link on a page.

<a href="index.htm">BACK</a>

Obviously, clicking on it will go back to the page that you came from if it was index.htm. I would like to know how I can substitute something to do the same as clicking on the back button of the browser. This way, whencoming from a different page, it will go back to that page? Does anyone know how I can do this?

[Synook]

http://www.w3schools.com/jsref/met_his_back.asp